Carbon brush for commutators and the method of preparing same.



875,750. PATENTED JAN. 7, 1908.

E. 0. VAN NORT, 3R. CARBON BRUSH FOR GOMMUTATORS AND THE METHOD OF PREPARING SAME.

APPLICATION FILED MAR. 19,1906

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CARBGNBRUSH FOR M O S AND THE METHODOF PR PARINGSAME.

Specification of Letters Patent.

Patented Jan. 7, 1908.

Application filed March 19.1906. Serial No- 806i868.

To all whom it 771(14/ concern:

Bo it-known that 1, EDWIN (1. VAN Noni,

Jr. a citizen of the United States, andresident oi St. Louis Missouri, have invented certain new and useful Improvements in Carbon Brushes 'l'or'Commutators and the Method of Preparing Same, of which the i015 lowing is a specification containing a full, clear, and exact description, reference being had to the accompanying draw ngs, a part hcrco'l'.

My invention relates to a carbon brush for con'imutaiors, and the same. V y I The object of my invention is to prepare a suitable liquid compound in which the sar bon brushcs are immersed until thcy absorb a. certain quantity of tho-compouinl, for the purpose of making said brushes self-lubricat mg, andigrcatl y increasing the length of time whichsaid brushes can he used in actual sermicc, and also its-electrical conductivity.

lo the drawingsz 'l igulfol is a erSpctivc viewof a carbon brush heiore t 16 same is treated by my improved,method, and a section oi said brush being removed Fig. 2 IS a view analogous to Fig. 1, and showing'tlle A brush after the improved method.

1 i lesignates a. brush which is manufactured in the usual manner of iinoly divided particles of 51LI'l)()Il,' bonded together in any same has been treated by my suitable manner, and ofsuch'sizc as to be readily positioned in the ,usualbrush holder.

in making up approxinnttcly 7 lbs, of the composition with Which the brushes are treated, I make use of 5 lbs. of purified paraflin, 2 lbs. of commercial yellow: wax, 2 oz. of iinely powdered ph'nnbago, and 20 drops oi oil of citronclla,the latter being used for the purpose of preventing rats, mice, and in sects from eatiu the composition. The p'arallin and yellow weX are melted and mixed, and while in a liquid state, tlutplumhalgo and oil of citronella arenddml. The com position is now heated until it is brought to the boiling; point,- und the carbon brushes arc now immersed in the boiling liquid. This action necessarily causes said carbon brushes to 0X- pand to' a certainiicgl'oc, or drives a certain amount of theaii' out of the aircells in the brushes, and, as a result, in a short period, of tiinethe brushes bccoinc thoroughly saturated with the composition.

the brushes and lnothod of? preparing tah'iulf bloeks of ordinar cats the surface of the commutator, owing to 1 the presence of the plumba-go, and the parafiin and wax, and by t iis treatment the wear on commutator is decreased; hence they last much lower than the untreated brushes, and the lie of tater is prolonged.

Carbon brushes treated by my improved method Wear much more evenly than the untreated brushes, and much'tiine and labor is savcdin lubricating commutators, which is necessary where untreated brushes are made use of.

The oil'of -eitronelia is not absolutely necessary'in the composition, as it is onlyused for. preventing the compound from being eatcn by rats and mice. 3

I have found out by experience, by. treat-1 ingthe brushes by the above method, that the heat in both commutator and brushes is greatly decreased.

l claim:

in" commutator brushes, which consists in ta ing' blocks of ord nary commercially prel.- The herein described process ofproducf pared carbon, such. as is utilized for carbon nus'hes; and immersing and trcatin said blocks 'in a boiling liquid, which holds in suspension finely powdered plumbago or graphite.

fl. 'llhe l-ierein described process of produciug' con'imutator brushes, which consists in y con'unercially pre pared carbon, such as is utilized for carbon brushes, and inirnersingsand retaining said blocks in boiling wax of high pcnetrativc power, having in suspension finely powdered plunibago or graphite.

3. The iGl'l-IlflGSCIlbOd. process of producing (wmnnutator brushes, which consists in taking blocks of ordinary commercially prepared carbon, such as is utilized for'carbon brushes, and inn nersiiig said block in an ole- 'aginous boiling liquid, having in suspension i'inoly powdered plumbau'o orgraphite.

4. The herein described method of pre paring: for use brushes for coiuniutators, which consists in :lirst tahinp a. block of comnir-rciall prcpzu'ed counuutator brush unite rial, cuttin said block into proper size for commutator brushes. and third, innncising the brushes in a boil-in solution of 'iaral'lin ycllow wax and plumbago.

5. As a new article o! nuniuiucturc, a com- 1111] tater brush, constructed 01 a block of carb011, which is permeated throu hout with wax, carrying finely powdered p umbago or graphite.

6. As a new article of manufacture, a commutator brush of carbon, permeated throughout with /an oleaginous substance, carrying finely divided particles of plnmbego or graphitfe.

In testimony whereof, I. have signed my name to this specification, in presence of two 10 subscribing witnesses.

EDWIN 0. VAN NORT, JR.

Witnesses M. P. SMITH, H. G. FLETCHER. 

